<template>
  <div class="article-container">
    <!-- 导航栏 -->
    <van-nav-bar
      class="page-nav-bar"
      left-arrow
      title="头条"
      @click-left="$router.back()"
    ></van-nav-bar>
    <!-- /导航栏 -->

    <div class="main-wrap">
      <!-- 加载中 -->
      <div v-if="loading" class="loading-wrap">
        <van-loading
          color="#3296fa"
          vertical
        >加载中</van-loading>
      </div>
      <!-- /加载中 -->

      <!-- 加载完成-文章详情 -->
      <div  v-else-if="articles.title" class="article-detail">
        <!-- 文章标题 -->
        <h1 class="article-title">{{articles.title}}</h1>
        <!-- /文章标题 -->

        <!-- 用户信息 -->
        <van-cell class="user-info" center :border="false">
          <van-image
            class="avatar"
            slot="icon"
            round
            fit="cover"
            :src="articles.aut_photo"
          />
          <div slot="title" class="user-name">{{articles.aut_name}}</div>
          <div slot="label" class="publish-date">{{articles.pubdate | relativeTime}}</div>
          <follow-article
            :isfollow="articles.is_followed"
            :articles-id="articles.aut_id"
            @update-isFollow="articles.is_followed = $event"

          ></follow-article>
<!--        <van-button-->
<!--          v-if="articles.is_followed"-->
<!--         class="follow-btn"-->
<!--         round-->
<!--        size="small"-->
<!--          @click="onFlow"-->
<!--          :loading="followloading"-->
<!--     >已关注</van-button>-->
<!--          <van-button-->
<!--            v-else-->
<!--            class="follow-btn"-->
<!--            type="info"-->
<!--            color="#3296fa"-->
<!--            round-->
<!--            size="small"-->
<!--            icon="plus"-->
<!--            @click="onFlow"-->
<!--            :loading="followloading"-->
<!--          >关注</van-button>-->

        </van-cell>
        <!-- /用户信息 -->

        <!-- 文章内容 -->
        <div class="article-content markdown-body"
             v-html="articles.content"
            ref="articles-content"
        ></div>
        <van-divider>正文结束</van-divider>


        <!-- 底部区域 -->
        <div class="article-bottom">
          <van-button
            class="comment-btn"
            type="default"
            round
            size="small"
          >写评论</van-button>
          <van-icon
            name="comment-o"
            info="123"
            color="#777"
          />
<!--   收藏文章-->
          <collect-article
            v-model="articles.is_collected"
            :articles-id="articles.art_id"
          ></collect-article>
<!--点赞-->
          <like-artcle   v-model="articles.attitude"
                         :articles-id="articles.art_id"
          ></like-artcle>


          <van-icon name="share" color="#777777"></van-icon>
        </div>
        <!-- /底部区域 -->
      </div>
      <!-- /加载完成-文章详情 -->

      <!-- 加载失败：404 -->
      <div  v-else-if="errStatus === 404" class="error-wrap">
        <van-icon name="failure" />
        <p class="text">该资源不存在或已删除！</p>
      </div>
      <!-- /加载失败：404 -->

      <!-- 加载失败：其它未知错误（例如网络原因或服务端异常） -->
      <div v-else class="error-wrap">
        <van-icon name="failure" />
        <p class="text">内容加载失败！</p>
        <van-button class="retry-btn" @click="getArticleById">点击重试</van-button>
      </div>
      <!-- /加载失败：其它未知错误（例如网络原因或服务端异常） -->
    </div>

  </div>
</template>
<script>

import { getArticleById  }  from  '@/api/article'
import  './github-markdown.css'  //引入样式
import { ImagePreview } from 'vant'; //引入图片预览组件
import followArticle  from '@/components/follow-article'
import CollectArticle  from '@/components/CollectArticle'
import likeArtcle  from '@/components/like-article'

export default {
name: "ArticleIndex",
  data(){
  return{
    articles:{},//文章详情
    loading:false,
    errStatus:0,
    followloading:false
  }
  },
  components:{
  followArticle,
    CollectArticle,
    likeArtcle
  },
  props:{

  articleId:{
    type:[String,Number,Object], //因为用户可能直接复制连接去查看文章，这时就是字符串的，从我们的列表点击进去的就是数字类型的id

    required:true
  }
  },
  created() {
  this.getArticleById()
  },
  methods:{
  //获取文章详情
   async getArticleById(){
      try {
     const {data} = await  getArticleById(this.articleId)
        this.articles=data.data
        this.loading=false

    //数据影响到的视图的更新不是立即的,所以我们这里用了个延迟函数
        setTimeout(()=>{
        this.previewImage()
        },0)
      }catch (err){
        if (err.response && err.response.status === 404){
          this.errStatus=404
        }
        this.loading=false
        console.log(err)
      }

    },
//图片预览
    previewImage(){


     const articlesContent=this.$refs['articles-content']
      const imgs=articlesContent.querySelectorAll('img')
      const images=[]
      imgs.forEach((item,index) =>{
        images.push(item.src)
        item.onclick=()=>{
          ImagePreview({
            images:images ,
            startPosition: index,
          });
        }

      })




    },



  }
}
</script>

<style scoped lang="less">

.article-container {
  .main-wrap {
    position: fixed;
    left: 0;
    right: 0;
    top: 92px;
    bottom: 88px;
    overflow-y: scroll;
    background-color: #fff;
  }
  .article-detail {
    .article-title {
      font-size: 40px;
      padding: 50px 32px;
      margin: 0;
      color: #3a3a3a;
    }

    .user-info {
      padding: 0 32px;
      .avatar {
        width: 70px;
        height: 70px;
        margin-right: 17px;
      }
      .van-cell__label {
        margin-top: 0;
      }
      .user-name {
        font-size: 24px;
        color: #3a3a3a;
      }
      .publish-date {
        font-size: 23px;
        color: #b7b7b7;
      }
      .follow-btn {
        width: 170px;
        height: 58px;
      }
    }

    .article-content {
      padding: 55px 32px;
      /deep/ p {
        text-align: justify;
      }
    }
  }

  .loading-wrap {
    padding: 200px 32px;
    display: flex;
    align-items: center;
    justify-content: center;
    background-color: #fff;
  }

  .error-wrap {
    padding: 200px 32px;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    background-color: #fff;
    .van-icon {
      font-size: 122px;
      color: #b4b4b4;
    }
    .text {
      font-size: 30px;
      color: #666666;
      margin: 33px 0 46px;
    }
    .retry-btn {
      width: 280px;
      height: 70px;
      line-height: 70px;
      border: 1px solid #c3c3c3;
      font-size: 30px;
      color: #666666;
    }
  }

  .article-bottom {
    position: fixed;
    left: 0;
    right: 0;
    bottom: 0;
    display: flex;
    justify-content: space-around;
    align-items: center;
    box-sizing: border-box;
    height: 88px;
    border-top: 1px solid #d8d8d8;
    background-color: #fff;
    .comment-btn {
      width: 282px;
      height: 46px;
      border: 2px solid #eeeeee;
      font-size: 30px;
      line-height: 46px;
      color: #a7a7a7;
    }
    .van-icon {
      font-size: 40px;
      .van-info {
        font-size: 16px;
        background-color: #e22829;
      }
    }
  }
}

</style>
